Input: samsung-keypad - remove set but unused variable 'var'

Fixes the following W=1 kernel build warning(s):

 drivers/input/keyboard/samsung-keypad.c: In function ‘samsung_keypad_irq’:
 drivers/input/keyboard/samsung-keypad.c:149:15: warning: variable ‘val’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20201112110204.2083435-3-lee.jones@linaro.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/samsung-keypad.c

@@ -146,13 +146,12 @@ static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
 {
 	struct samsung_keypad *keypad = dev_id;
 	unsigned int row_state[SAMSUNG_MAX_COLS];
-	unsigned int val;
 	bool key_down;
 
 	pm_runtime_get_sync(&keypad->pdev->dev);
 
 	do {
-		val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
+		readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
 		/* Clear interrupt. */
 		writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);